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36.

1. You take the coefficient of x : = 12
2. Halve it : = 6
3. Then square it : = 36
4. Add it.

This gives x2 + 12x + 36 = (x + 6)2

The above method only works if the coefficient of x2 is 1. If it is not then the processs is slightly more complicated.

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Q: How do you complete the square x squared plus 12x plus?
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